Unusual ancient spider with tail discovered by scientists in Myanmar

The discovered arachnids are equipped with fangs, twin feelers, also known as pedipalps, and spinnerets which produce the silk at the rear.

Researchers think the spiders lived among the trees due to their amber coffins. Numerous other often-spectacular Cretaceous amber finds coming out of Southeast Asia these days (see, for example, the tick preserved clinging to a dinosaur feather or 2016's entire feathered dinosaur tail) have taken a similar route to scientific notice. Each spider was about 3mm long with a tail measuring up to 5mm. Mesothelae spiders are only found in China, Japan, and Southeast Asia today.

The specimens were not discovered by the researchers in situ in Myanmar, but instead were collected by dealers and sold to Chinese researchers. But they also have long, thin tails that these ancient arachnids probably used to sense their environments, a much more primitive feature seen only in fossilized proto-spiders known as uraraneids. He thought the presence of spinnerets pulled it to the side of spiders. "From the back, it would have looked quite similar". It has "spinnerets" located at its read end through which it once produced silk.

"However, like all spiders it would have been a carnivore and would have eaten insects, I imagine", Seldon said. "Egg-wrapping is a vital function for spider silk, as well as laying a trail to find its way back home".

But Selden said these differences in evolutionary placement are pretty insignificant.

Another view of the holotype of C. yingi as it was preserved in amber for 100 million years...coincidentally the same number of nightmares today's announcement will foster.

Its tail was longer that its body and was used as a sensory device to seek out prey or escape predators. The ancient arachnids are described as "chimeras" after the hybrid beast of Greek mythology, because they have a curious mix of primitive and modern body parts. The tail would have been unnecessary and would have eventually been lost. The other thinks the arachnid may have been an early branch of modern spiders-"a kind of missing link" between the uraraneids and the spiders we know today, Selden tells Ian Sample of the Guardian.

How the spider would have looked. Image University of Kansas

"We haven't found them", he says in the University of Kansas statement, "but some of these forests aren't that well-studied, and it's only a tiny creature". "We've not found fossils before that showed this, and so finding this now was a huge surprise", said Garwood.

One of the team members, Professor Paul Selden of the Paleontological Institute and Department of Geology at the University of Kansas, explained how the highly-desired substance helped change the thinking of arachnid development.

Amber has already built up its reputation as a time capsule for ancient species.

Four fossils of the tiny crawlers were found largely intact, encased in Burmese amber that were recovered from Myanmar by researchers.

And the list of discoveries may go on. "We can only speculate that, because it was trapped in amber, we assume it was living on or around tree trunks", Selden said.

"Any sort of flagelliform appendage tends to be like an antenna", Selden said in a KU News Service report.

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